Thanks for the replies so far, just a few points:
There was no cloud around at all.
The residential area thing is not the case as of only seen this with a few flights.
The crew forgetting to switch them on is a possibility, 10 years working at the airport I've seen pilots forget to turn various lights and beacons on and off when they are supposed to on occasions.
But in this case I think it may be done when they are close to the aircraft in front but I'm hoping someone in the know would be able to confirm this.
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